Combined water storage tank and building



FIG. 1 is a front perspective view of a combined water storage tank and building showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is an elevational view taken from one side thereof, the opposite side being the same as the side shown; and

FIG. 4 is a top plan view thereof. 

The ornamental design for a combined water storage tank and building, as shown and described. 